sounds your trailer is set up like mine - convenience center has 3 control levers and 3 inlets? If so, one inlet is black tank rinse, the next is freshwater inlet, and third is antifreeze inlet, and levers are: water tank fill, water heater bypass, and antifreeze on/off.
If you connect a short hose to the antifreeze inlet (I use an extra short freshwater hose that I cut in half, saving the other end for when I fill using the gravity fill) and then put the other end of hose into jug of rv antifreeze, the lever changes the pump inlet to where it sucks in antifreeze, rather than water from tank; it diverts the pump inlet.
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2012 Keystone Vantage 32FLS
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